Substituted 6,7-dihydro-indole-4-(5h)-one

ABSTRACT

COMPOUNDS OF THE FORMULA   1-R4,2-R3,3-R2,5-((2-R1-1,4-DIOXA-8-AZASPIRO(4.5)-   DEC-8-YL)-CH2-)-6,7-DIHYDROINDOLE-4(5H)-ONE   WHEREIN R1, R2, R3 AND R4 EACH REPRESENT A MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, (LOWER) ALKYL, (LOWERALKENYL, (LOWER)ALKNYL, PHENYL AND BENZYL; AND THE PHARMACEUTICALLY ACCEPTABLE NONTOXIC SALTS THEREOF EXHIBIT TRANQUILIZING AND ANTIEMETIC ACITVITY AND ARE USEFUL AS TRANQUILIZERS AND ANTIEMETIC AGENTS IN MAMMALS.

United States Patent US. Cl. 260294.7 12 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula GHz-GH-R o wherein R R R and R each represent a member selected from the group consisting of hydrogen, (lower) alkyl, (loweralkenyl, (lower)alkynyl, phenyl and benzyl; and the pharmaceutically acceptable nontoxic salts thereof exhibit tranquilizing and antiemetic activity and are useful as tranquilizers and antiemetic agents in mammals.

III o BACKGROUND OF THE INVENTION (1) Field of the invention This invention relates to novel compounds exhibiting tranquilizing and antiemetic activity which are useful as tranquilizers and antiemetic agents in mammals. In another aspect this invention relates to a method of preparing the novel compounds.

(2) Description of the prior art An object of the present invention is to provide novel compounds which would be of value as tranquilizing agents and antiemetic agents in mammals. While some compounds having such activity are known in the art there is a need for additional agents having tranquilizing and antiemetic activity.

SUMMARY OF THE INVENTION There is provided according to the present invention compounds represented by the following structural formula' wherein R R R and R each represent a member selected from the group consisting of hydrogen, (lower) alkyl, (lower)alkenyl, (lower)alkynyl, phenyl and benzyl; and the pharmaceutically acceptable nontoxic salts thereof.

3,591,594 Patented July 6, 1971 The pharmaceutically acceptable nontoxic salts include the organic and inorganic acid addition salts, e.g., those prepared from acids such as hydrochloric, sulfuric, sulfonic, tartaric, fumaric, hydrobromic, hydroiodic, glycolic, citric, maleic, phosphoric, succinic, acetic and the like. Such salts are prepared by conventional methods by reacting the free base with the desired acid on about an equimolar basis.

The term (lower)alkyl as used herein means both straight and branched chain alkyl radicals containing from 1 to 8 carbon atoms, e.g., methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, amyl, hexyl, Z-ethylhexyl, etc.

The term (lower)alkenyl as used herein means both straight and branched chain alkenyl radicals containing from 2 to 8 carbon atoms, e.g., ethenyl, allyl, l-propenyl, l-butenyl, 3-butenyl, 2-methyl-1-propenyl, 3-pentenyl, 1- hexenyl, 7-octenyl, etc.

The term (lower)alkyl as used herein means both straight and branched chain alkynyl radicals containing from 2 to 8 carbon atoms, e.g., ethinyl, propargyl, 1- butinyl, 2-butinyl, 1,1-dimethylpropargyl, l-pentinyl, 1- heptinyl, etc.

A preferred embodiment of the present invention consists of the compounds of the formula (lower) alkyl.

A still more preferred embodiment of the present invention consists of the compounds of the formula III carom L 0 1T1 I on R2 N/ R3 H wherein R and R are each hydrogen or (lower) alkyl and preferably (lower)alkyl.

The compounds of this invention may be prepared for example via a Mannich reaction as described in Belgium Pat. No. 670,798 by reacting a 4,4-ethylenedioxypiperidine of the formula un-( aten o 0 wherein R is as previously defined or an acid addition salt thereof, e.g. hydrochloride with about an equimolar amount of a 6,7-dihydroindole-4-(5H)one of the formula whereinR R and R are as previously defined, in the presence of base, e.g. potassium hydroxide, sodium hydroxide and the like and in the presence of an alcoholic solvent such as isopropanol, ethanol andthe like. Preferably the reaction is carried out at a temperature of from about to 100 C. and most preferably at about ambient temperature.

The ethylenedioxypiperidines of Formula IV used as starting materials are produced according to the method of Stach et al., Monatshefte der Chemie, 93, 1090 (1962); Chem. Abstr. 59, 8750 g., by reacting a piperidone hydrochloride with the appropriate ethyleneglycol and removing the water formed azeotropically with benzene.

The 5 methylene 6,7 dihydroindole 4 (5H)- ones of Formula VI are formed from the 6,7-dihydroindole-4-(5H)-ones [the preparation thereof is described by H. Stetter and Lauterbach, Ann. 655, 20 (1962); K. E. Schulte, I, Reisch, and H. Lang, Chem. Ber. 96, 1470 (1963); S. Hauptmann, H. Blume, G. Hartmann, D. Haendel and D. Franke, Zeitschrift fiir Chemie, 6, 107 (1966)] via the following reaction sequence which is exemplified below:

wherein, R R and R are as previously defined.

The compounds of Formula V are prepared according to the procedure described in Belgian Pat. No. 670,798.

The compounds of this invention possess tranquilizing activity and antiemetic activity making them useful as tranquilizers and antiemetics in mammals.

The tranquilizing activity of the compounds of this invention was evaluated by the standard condition response 4 test. When for example 3 ethyl 6,7 dihydro 2- methyl 5 (4',4 ethylenedioxypiperidinomethyl) indo1e-4-(5H)-one was administered to the rat p.o. the avoidance ED was 1 mg./kg. and the escape ED was 25 mg./kg.

The antiemetic activity of the compounds of this invention was evaluated by the standard antiapomorphine test. In the test, dogs are administered the test compound p.o. 60 minutes prior to intravenous administration of a dosage of 50 rug/kg. of apomorphine. Failure of the dog to vomit is a positive response. When for example 3-ethyl- 6,7 dihydro 2 methyl 5 (4',4' ethylenedioxypiperidinomethyl)indole-4-(5H)-one was tested it exhibited an MED of 0.1 mg./kg. in the dog.

The compounds of this invention may be administered as the free bases or in the form of their nontoxic addition salts. They may be compounded and formulated into pharmaceutical preparations in unit dosage form for oral or parenteral administration with organic or inorganic solid materials or liquids which are pharmaceutically acceptable carriers. Some examples of the carriers which can be used are gelatin capsules, sugars, cellulose derivatives such as carboxymethylcellulose, gelatin, talc, magnesium stearate, vegetable oil such as peanut oil, etc., liquid petroleum, glycerin, sorbitol, ethanol, agar, elixirs, syrups and Water including sterile water. The composition may take the form of tablets, powders, granules, capsules, suspensions, solutions, and the like.

The compounds of this invention when administered orally or parenterally in a tranquilizing or antiemetic amount are effective in tranquilizing mammals and inhibiting vomiting in mammals. An oral dosage range of about 0.4 to about 5 milligrams per kilogram per day is convenient for tranquilizing mammals and a range of about 0.1 to about 5 milligrams per kilogram per day is convenient for inhibiting vomiting in mammals, which may be administered in divided dosage, e.g., two, three or four times a day. In man an oral dosage range of about 10 to about 200 milligrams per day for tranquilizing and about 5 to about 200 milligrams per day for inhibiting vomoting is convenient. For further information with respect to the administration of the compounds of this invention to man G. M. Simpson and L. Krakov, Curr. Therap. Res., 10, 41 (1968) and A. A. Sugerman and J. Herrmann, Clin PharmacoL, Therap., 8, 261 (1967) can be consulted which related to the administration to man of molindone a related compound.

Administration of the compounds is conveniently begun at the minimal effective dose (MED) or ED of the particular compound in the particular species of mammal. However, in general, the particular dosage most suitable for a particular application, as might be expected, will vary with the age, weight and general health of the mammal under treatment and the degree of tranquility or antiemetic effect required. After taking into consideration these factors and any other factors to be considered, one skilled in the art of treating diseases of mammals can readily determine the appropriate dosage.

The following examples are intended to illustrate the invention described herein without unduly restricting it.

EXAMPLE 1 Preparation of 3-ethyl-6,7-dihydro-2-methyl-S-dimethylaminomethyl-indole-4-(5H)-one hydrochloride 0 CH3 II /NOH CHzOHa CH3 CHs N H 0.165 mol.) and ethanol (225 ml.) was heated at reflux temperature with stirring for 24 hours. Paraformaldehyde (1.65 g., 0.055 mol.) was added and the heating continued. Refluxing was continued for an additional 24 hours. The reaction mixture was concentrated to one-half of its original volume and after cooling, the precipitate was removed by filtration. The solid isolated weighed 15.3 g. and melted at 184-186 C. From the mother liquor three subsequent crops were obtained and recrystallized from ethanol. The first solid crop was also recrystallized from ethanol. A total of 14.46 g. (48% yield) of solid was obtained by combining the recrystallized fractions. The melting point is 183187 C.

EXAMPLE 2 Preparation of 3-ethyl-6,7-dihydro-2-rnethyl-S-dimethylaminomethyl-indo1e-4-(5H)-one methiodide An aqueous solution of 3-ethyl-6,7-dihydro-2-methyl-5- dimethyl-arninomethyl-indole-4-(5H) one hydrochloride (14.46 g., 0.053 mol.) and water (60 ml.) was treated with one equivalent of aqueous sodium hydroxide. The resulting mixture was extracted with ether. The ethereal extract was dried over anhydrous potassium carbonate then added dropwise to methyl iodide (22.7 g., 0.16 mol.) dissolved in ether (50 ml.). The mixture was stirred for two days, the solid collected and dried, yield 17.7 g. (86% yield); M.P. 218-219 C.

EXAMPLE 3 Preparation of 3-ethyl-6,7-dihydro-2-methyl- -methylene-indole-4- 5 H) -one CH2- CH CHS CH3 N H A cool solution of sodium hydroxide (0.2 g., 0.005 mol.) in water (20 ml.) was added dropwise to a solution of 3- ethyl 6,7 dihydro-2-methyl-5-(dimethylaminomethyl)- indole-4-(5H)-one methiodide (1.83 g., 0.00487 mol.) in Water (135 ml.). The reaction mixture was stirred for 3 hours at 20 C. The solid that precipitated was collected and air dried; it weighed 1.55 g.; a dry sample melted at 208210 C.

EXAMPLE 4 Preparation of 3-ethyl 6,7-dihydro-2-methyl-5-(4',4'- ethylenedioxypiperidinomethyl -indole-4- 5 H) -one To a solution of 3-ethy1-6,7-dihydro-2-methyl-S-methyleneindole-4-(5H)-one (1.89 g., 0.01 mol.) in methanol (150 ml.) was added potassium hydroxide (one pellet) and 4,4-ethylenedioxypiperidine (1.43 g., 0.01 mol.). The mixture was swirled and allowed to stand for seven days. It was then evaporated. The residue was dissolved in refluxing isopropanol and permitted to stand. A first solid 6 crop was collected; it weighed 2.3 g., M.P. 182-183 C. A sample of the product, 3-ethyl-6,7-dihydro-2-methyl-5-(4, 4'-ethylenedioxypiperidinomethyl)-indole 4 (5H)-one, recrystallized from isopropanol for analysis melted at 184-185" C.

Analysis.-Calcd. for C H N O (percent): C, 68.64; H, 8.49; N, 8.43. Found (percent): C, 68.88; H, 8.27; N, 8.49.

EXAMPLE 5 Preparation of 3-ethyl-6,7-dihydro-2-methyl-5-(4,4-ethylenedioxypiperidinomethyl)-indole-4-(-5H) one hydrochloride EXAMPLE 6 Preparation of 3-ethyl-6,7-dihydro 2 methyl-5-(4',4'-

ethylenedioxypiperidinomethyl)-indole 4 (5H) one sesquifumarate To a solution of 3-ethyl-6,7-dihydro-2-methyl-4-(4',4'- ethylenedioxypiperidinomethyl)-indole-4-(5H) one (3.3 g.)and refluxing isopropanol (15 ml.) was added a solution of fumaric acid (1.16 g.) dissolved in refluxing isopropanol (1.5 ml.). The resulting solution was cooled to room temperature then refrigerated. The solid which separated was collected. It Weighed 2.5 g. and melted at 153.5-156 C. The solid was recrystallized from isopropanol (40 ml.) which yielded 1.9 g. solid salt melting at 152154 C. A sample prepared in the same manner gave M.P. 156.5157.5 C.

AnalySis.Calcd for C H N O 2 C, H, N, 5.54. Found: C, 59.24; H, 7.03; N, 5.48.

EXAMPLE 7 When in the procedure of Example 4, 4,4-ethylenedioxypiperidine is replaced by an equal molar amount of 4,4- (methylethylenedioxy piperidine, 4,4- (ethylethylenedioxy piperidine,

4,4- (vinylethylenedioxy) piperidine,

4,4- (ethinylethylenedioxy piperidine, 4,4- (phenylethylenedioxy) piperidine 4,4- (benzylethylenedioxy) piperidine,

4, 4- (propylethylenedioxy) piperidine, 4,4- (isopropylethylenedioxy piperidine, 4,4- (hexylethylenedioxy pip eridine,

4,4- (allylethylenedioxy) piperidine, 4,4-(propargylethylenedioxy) piperidine, 4,4 l-butinylethylenedioxy piperidine, 4,4- (isobutylethylenedioxy) piperidine,

4 4- (butylethylenedioxy piperidine,

4,4- (t-butylethylenedioxy) piperidine, and 4,4-(1-butenylethylenedioxy)piperidine,

there are obtained 3 -ethyl-6,7-dihydro-2-methyl-5- [4,4'- methylethylenedioxy) -pip eridinomethyl] -indole-4- (5 H) -one,

3 -ethyl-6,7-dihy.dro-2-methyl-S- [4',4'-ethylethy1enedioxy -piperidinomethyl] -indole-4- (5H) -one,

3 -ethyl-6,7-dihydro-2-methyl-5- [4,4- (vinylethylenedioxy) -piperidinomethyl] -indole-4- (5 H) -0ne,

3-ethyl-6,7-dihydro- 2-methyl-5- 4',4- (ethinylethylenedioxy) -piperidinomethyl] -indole-4- 5H) -one,

3 -ethyl-6,7-dihydro -2-methyl-5- [4',4- (phenylethylenedioxy) -piperidinomethyl] -indole-4- 5 H) -one,

3 -ethyl-6,7-dihydro-2-methy1-6- [4,4- (benzylethylenedi- 13 14 2. A compound of claim 1 having the formula wherein R and R are (lower) alkyl.

6. The compound having the formula (|JHzC|3H-R 'fi o o 5 O O 0 0 N I f I OH CH 0121,0113

CH: a i

7. A pharmaceutically acceptable nontoxic salt of the compound of claim 6.

wherein R R R and R each represent a member se- The compound having the formula lected from the group consisting of hydrogen and (lower) CH 6 alkyl; and the pharmaceutically acceptable nontoxic salts I thereof. o 0

3. A compound of claim 1 having the formula CH2(JH2 N (I) (in T-om JCH CHa H N I! E R2 9. The compound having the formula N/ R3 (llHzmilHz wherein R R and R each represent a member selected 0 from the group consisting of hydrogen and (lower)alkyl. f i

4. A compound of claim 1 having the formula 0H GH3 N -CHs n w H Y 0 0 10. The compound having the formula ?H2?Hg N I o 0 l CH R2 ITI CH CH2OH3 wherein R and R each represent a member selected (3132033 from the group consisting of hydrogen and (lower)alkyl. H

5. A compound of claim 1 having the formula 12 .The compound having the formula O I? H CH CH CHa CH3 i CH2 1 6 References Cited UNITED STATES PATENTS 3,424,755 1/1969 Denss et a1 260-294.7D

FOREIGN PATENTS 670,798 1/1966 Belgium.

HENRY R. JILES, Primary Examiner 10 S. D. WINTERS, Assistant Examiner US. Cl. X.R.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent NO- Dated In e t Harvey Byron PPS and John Hans 13161 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the claims, change the formula in Claim 1 to read:

1. A compound selected from the group consisting of compounds of the formula CH CH --R Signed and sealed this 11th day of January 1972.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Acting Commissioner of Patents FORM pomso USCOMM-DC 60376-Pfl9 US, GQVERNMENT PRINTlNG OFFICE l 1.. -3-13l 

